/*
 * Copyright 2009 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.gtugs.web;

import org.gtugs.domain.Chapter;
import org.gtugs.service.ChapterManager;
import org.springframework.web.servlet.mvc.Controller;
import org.springframework.web.servlet.ModelAndView;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author jasonacooper@google.com (Jason Cooper)
 */
public class DirectoryController implements Controller {

  private static final int NUM_COLUMNS = 3;

  private ChapterManager chapterManager;

  public ModelAndView handleRequest(HttpServletRequest request,
      HttpServletResponse response) throws ServletException, IOException {
    Map<String, Object> model = new HashMap<String, Object>();
    model.put("columns", buildColumns());

    return new ModelAndView("directory", "model", model);
  }

  public void setChapterManager(ChapterManager chapterManager) {
    this.chapterManager = chapterManager;
  }

  private  List<List<List<Chapter>>> buildColumns() {
    int chapterCount = chapterManager.getChapterCount();
    List<List<Chapter>> groups =
      chapterManager.getChaptersGroupedByCountry();

    if (groups == null) {
      return null;
    }

    int count = 0;
    List<List<List<Chapter>>> columns =
        new ArrayList<List<List<Chapter>>>(NUM_COLUMNS);
    List<List<Chapter>> column = new ArrayList<List<Chapter>>();
    for (int i = 0; i < groups.size(); i++) {
      List<Chapter> group = groups.get(i);
      for (int j = group.size() - 1; j >= 0; j--) {
        if (group.get(j).getStatus().equals("inactive")) {
          group.remove(j);
        }
      }

      if (count != 0 && columns.size() != (NUM_COLUMNS - 1) &&
          (count + group.size()) > (chapterCount / NUM_COLUMNS)) {
        columns.add(column);

        column = new ArrayList<List<Chapter>>();
        count = 0;
      }

      column.add(group);
      count += group.size();
    }

    columns.add(column);

    return columns;
  }
}
